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Alaska Volcanoes Update
Friday, February 21, 1997, 10:30 AM AST (1930 UTC)
Pavlof Volcano: 55.42°N, 161.9°W 8,262 ft elevation
CURRENT LEVEL OF CONCERN CODE IS YELLOW
The eruptive pause at Pavlof Volcano is now beginning its eighth week.
AVO seismometers continue to record very low levels of seismicity
at the volcano. NWS observers in Cold Bay reported a small
steam plume up to 1000 feet above the summit vents last
weekend, and pilots reported on Wednesday a similar steam
plume 2000 to 3000 feet above the volcano.
Based on comparisons to other historical eruptions at Pavlof, it is
possible that this pause will persist for weeks or months,
followed by resumption of ash and lava emission with little or no
warning. Accordingly, AVO continues to monitor the volcano
closely and will issue further updates as the situation changes.
Pavlof is located 600 miles southwest of Anchorage. The nearest towns
to the volcano are Cold Bay (37 mi SW), King Cove (30 mi SW),
Sand Point (60 mi E), and Nelson Lagoon (50 mi NE). AVO has a
seismic network of six stations near the volcano.
Okmok Volcano: 53.4°N, 168.17°W; 2,500 ft elevation
The small eruption that began on the morning of February 13 from a
cone within Okmok caldera continued this week. A hot spot
was visible on satellite images throughout the week and pilots
reported an ash plume to 16,000 feet ASL on Tuesday, February
18. Observers 10 miles east of the volcano at the former Fort
Glenn military base reported seeing a red glow over the
caldera on Tuesday night. The volcano is not monitored
seismically. Okmok is located on the eastern end of Umnak Island,
75 miles southwest of Dutch Harbor. The nearest settlements
are Nikolski (45 miles W) and former Fort Glenn military base
(10 miles E).
Iliamna Volcano: 60.04°N, 153.17°W; 10,196 ft elevation
The seismic swarm that began on 1 August 1996 beneath Iliamna
Volcano appears to be diminishing. Earthquake count averages
have gradually decreased over the past several weeks. Only 2
located events were recorded this week.